The Magpies are now in 16th place in the league, two points above the relegation zone.
"We need to take one step at a time", the 28-year-old told NUFC TV.
Spirit and aggression are vital for Southampton's hopes of turning their fortunes around and avoiding relegation from the Premier League this season, manager Mauricio Pellegrino said. I think that winning this game will be tough for Newcastle but they must get together and play for this club if they want to win. As the season draws to a close, the picture at the bottom is no clearer than it was a few weeks ago; any mistake can be costly, but a piece of magic can make anybody a hero in any given game.
Southampton have two of the best full-backs in the league and Pellegrino is expected to stick with them for this game.
Jamaal Lascelles is in the form of his life, and must have a good chance of making it into the England squad that Gareth Southgate will name on Thursday.
They could do with Islam Slimani being fit, though. However, Guido Carrillo is once more expected to lead the line while Josh Sims should retain his place in the side after impressing last week.
Kenedy, who was loaned to Newcastle by champions Chelsea in January, opened the scoring in the second after controlling a looping Jonjo Shelvey pass with his chest and turning superbly to beat visiting keeper Alex McCarthy.
But Southampton's place in the top division looks increasingly precarious.
Asked what difference Kenedy had made to his team, Benitez said: "It's more than his energy and pace, he's a player who is comfortable on the ball".
Newcastle United are a poor side this season but they have managed to play well on occasion, especially at home. Goals: Kenedy 2, 29, Ritchie 57.
In early team news, Charlie Austin and Maya Yoshida are the only injury concerns ahead of this game for Pellegrino. In the last ten minutes of the game, they were keeping the ball, passing it from one to the other and as a goalkeeper it's great when you see your defenders like that. Despite both sides having incredibly similar records from the season so far, it is Newcastle who have shown the most initiative on the pitch in recent games.
There is plenty of pressure on Pellegrino and his troops to deliver but the Argentine boss is confident that his men are up to the task.